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#include <fstream>
#include <cstring>
#include <cstdio>
using namespace std;
//FILE *fin=fopen("text.in","r")
ifstream fin("text.in");
ofstream fout("text.out");
long long i,l,k,nr;
char s,c;
int main()
{
nr=0;l=0;k=0;
while(fin.get(s))
{
if((s>='a'&&s<='z')||(s>='A'&&s<='Z'))
l++;
else if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
k++;
c=s;
}
if((s>='a'&&s<='z')||(s>='A'&&s<='Z')) k++;
if(k!=0)
fout<<l/k;
else fout<<0;
return 0;
}